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Simple model on the relationship between fish acoustical target strength and aspect for high‐frequency sonar in shallow waters
Author(s) -
Kubečka J.
Publication year - 1994
Publication title -
journal of applied ichthyology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.392
H-Index - 62
eISSN - 1439-0426
pISSN - 0175-8659
DOI - 10.1111/j.1439-0426.1994.tb00146.x
Subject(s) - target strength , fish <actinopterygii> , sonar , biology , simple (philosophy) , trout , fishery , horizontal plane , plane (geometry) , orientation (vector space) , noise (video) , statistics , acoustics , geometry , mathematics , physics , computer science , artificial intelligence , philosophy , epistemology , image (mathematics)
Summary The relationship between fish target strength and the orientation of fish in horizontal (yawing) and vertical (pitching) planes was modelled by the equation TS = m. cos 2 α+ b (also with cos 3 , cos 5 and cos 7 ). The cos 3 model gave the best fit of data for three fish species: brown trout, roach and rudd. The model can be used for 1) estimation of the most probable aspect in the horizontal plane; 2) estimation of the mean all‐aspect target strength of fish and 3) calculation of probability of recording of a fish of given size when a known noise threshold is applied.